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- FILTER Clause – DuckDB 15876
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...view Storage Versions and Format Execution Format Pivot Sitemap Live Demo Documentation / SQL / Query Syntax Copy Markdown FILTER Clause The FILTER clause may optionally follow an aggregate function in a SELECT statement. This will filter the rows of d...ata that are fed into the aggregate function in the same way that a WHERE clause filters rows, but localized to the specific aggregate function. There are multiple types of situations where this is useful, incl... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/filter.html
- Lambda Functions – DuckDB 13207
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...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...f the input list. The return type is defined by the return type of the lambda function. See list_transform examples . list_filter(list, lambda(x)) Constructs a list from those elements of the input list for which the lambda function returns true . Duck...DB must be able to cast the lambda function's return type to BOOL . The return type of list_filter is the same as the input list's. See list_filter examples . list_reduce(list, lambda(x, y)[, initial_value]) Reduces all e... - https://man.mtool.work/duckdb/1.3/sql/functions/lambda.html
- QUALIFY Clause – DuckDB 7621
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...rmat Pivot Sitemap Live Demo Documentation / SQL / Query Syntax Copy Markdown QUALIFY Clause The QUALIFY clause is used to filter the results of WINDOW functions . This filtering of results is similar to how a HAVING clause filters the results of aggre...ns applied based on the GROUP BY clause . The QUALIFY clause avoids the need for a subquery or WITH clause to perform this filtering (much like HAVING avoids a subquery). An example using a WITH clause instead of QUALIFY is included below the QUALIFY e... - https://man.mtool.work/duckdb/1.3/sql/query_syntax/qualify.html
- Integration with Ibis – DuckDB 7533
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...────┴───────┘ Common Operations Ibis has a collection of useful table methods to manipulate and query the data in a table. filter filter allows you to select rows based on a condition or set of conditions. We can filter so we only have penguins of the...species Adelie: penguins . filter ( penguins . species == "Gentoo" ) ┏━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳... - https://man.mtool.work/duckdb/1.3/guides/python/ibis.html
- File Formats – DuckDB 7444
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...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...ain basic statistics such as zonemaps . Thanks to these features, DuckDB can leverage optimizations such as projection and filter pushdown on Parquet files. Therefore, workloads that combine projection, filtering, and aggregation tend to perform quite...iles moderate. Bestpractice The ideal range is between 100 MB and 10 GB per individual Parquet file. Hive Partitioning for Filter Pushdown When querying many files with filter conditions, performance can be improved by using a Hive-format folder struct... - https://man.mtool.work/duckdb/1.3/guides/performance/file_formats.html
- Querying Parquet Metadata – DuckDB 6907
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...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...ta_page_offset BIGINT total_compressed_size BIGINT total_uncompressed_size BIGINT key_value_metadata MAP(BLOB, BLOB) bloom_filter_offset BIGINT bloom_filter_length BIGINT min_is_exact BOOLEAN max_is_exact BOOLEAN Parquet Schema The parquet_schema funct...; Below is a table of the columns returned by parquet_kv_metadata . Field Type file_name VARCHAR key BLOB value BLOB Bloom Filters DuckDB supports Bloom filters for pruning the row groups that need to be read to answer highly selective queries. Current... - https://man.mtool.work/duckdb/1.3/data/parquet/metadata.html
- SQL on Apache Arrow – DuckDB 6193
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...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...useful to point towards directories of Parquet files to analyze large datasets. DuckDB will push column selections and row filters down into the dataset scan operation so that only the necessary data is pulled into memory. import duckdb import pyarrow...also be queried as if they were regular tables. Scanners read over a dataset and select specific columns or apply row-wise filtering. This is similar to how DuckDB pushes column selections and filters down into an Arrow Dataset, but using Arrow compute... - https://man.mtool.work/duckdb/1.3/guides/python/sql_on_arrow.html
- SELECT Statement – DuckDB 6193
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...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...being indented: SELECT select_list FROM tables USING SAMPLE sample_expression WHERE condition GROUP BY groups HAVING group_filter WINDOW window_expression QUALIFY qualify_filter ORDER BY order_expression LIMIT n ; Optionally, the SELECT statement can b...he where clause or any aggregates). See the Samples page for more information. WHERE Clause The WHERE clause specifies any filters to apply to the data. This allows you to select only a subset of the data in which you are interested. Logically the WHER... - https://man.mtool.work/duckdb/1.3/sql/statements/select.html
- Relational API – DuckDB 6105
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...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...of two relational objects except_ Create the set except of this relation object with another relation object in other_rel filter Filter the relation object by the filter in filter_expr insert Inserts the given values into the relation insert_into Inse...25-04-10 11:43:05.711+02 │ │ 08ad11dc-a9c2-4aaa-9272-760b27ad1f5d │ value is uneven │ 7 │ 2025-04-10 11:47:05.711+02 │ ... filter Signature filter ( self : duckdb . duckdb . DuckDBPyRelation , filter_expr : object ) -> duckdb . duckdb . DuckDBPyRelatio... - https://man.mtool.work/duckdb/1.3/clients/python/relational_api.html
- Boolean Type – DuckDB 6105
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...CT FROM and JOIN WHERE GROUP BY GROUPING SETS HAVING ORDER BY LIMIT and OFFSET SAMPLE Unnesting WITH WINDOW QUALIFY VALUES FILTER Set Operations Prepared Statements Data Types Overview Array Bitstring Blob Boolean Date Enum Interval List Literal Types...arison i > 10 results in a Boolean value. Boolean values can be used in the WHERE and HAVING clauses of a SQL statement to filter out tuples from the result. In this case, tuples for which the predicate evaluates to true will pass the filter, and tuple...s for which the predicate evaluates to false or NULL will be filtered out. Consider the following example: Create a table with the values 5, 15 and NULL : CREATE TABLE integers ( i INTEGER )... - https://man.mtool.work/duckdb/1.3/sql/data_types/boolean.html
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